| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 4 | |
| #2 | Netherlands | 4 | |
| #3 | Australia | 2 | |
| #4 | WIPO (World Intellectual Property Organization) | 2 | |
| #5 | Bulgaria | 1 | |
| #6 | Canada | 1 | |
| #7 | China | 1 | |
| #8 | Estonia | 1 | |
| #9 | Hong Kong | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Civil engineering | |
| #3 | Mechanical elements | |
| #4 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Ships | |
| #2 | Structural elements | |
| #3 | Marine propulsion | |
| #4 | Gearing | |
| #5 | Pipes | |
| #6 | Reduction of greenhouse gas emissions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ludolphij Johannes Wilhelmus L | 12 |
| #2 | Ludolphy Johannes Wilhelmus Lu | 3 |
| #3 | Ludolphij J W L | 1 |
| #4 | Ludolphij Johannes | 1 |
| Publication | Filing date | Title |
|---|---|---|
| AU6483600A | Collision-resistant structure | |
| NL1010794C2 | Impact-resistant double-walled structure. | |
| EP0841502A1 | Whale-tail-type propulsion system for a vessel | |
| NL1003434C2 | Differential drive for a ship with two ship propellers. | |
| NL1002756C2 | Tubular construction with adjacent layers of tubing. | |
| NL1001669C2 | Shock-resistant piping system. |